AN2512 datasheet(31/38 Pages) STMICROELECTRONICS

31 / 38 page

AN2512

Example of source code

31/38

if (ReadSTPM01Falg

== 0){

for (i = 0; i < 3; i ++){

NewTemp = * new;

e->old[i] = NewTemp;// save the value for the first time reading

new ++; //next data

}

e->quot[0] = 0;

e->quot[1] = 0;

e->quot[2] = 0;

}

else{

e->quant[3] = 0;

for (i = 0; i <3; i++ ){

NewTemp = *new; // Rollover high to low occurs when MSB goes from F to 0

if (NewTemp >= e->old[i]){

if ((NewTemp - e->old[i]) >= 0x80000){

//roll over, negative energy

e->quant[i] = 0x100000 + e->old[i] -NewTemp;

e->quant[3] -= e->quant[i];//total ernergy minus the negative energy

}

else{

e->quant[i] = NewTemp - e->old[i];

//positive energy

e->quant[3] += e->quant[i]; //add the positive energy to the total energy

}

else{

if ((e->old[i] - NewTemp) >= 0x80000) { //roll over, positive energy

e->quant[i] = 0x100000 + NewTemp - e->old[i];

e->quant[3] += e->quant[i]; //total ernergy plus the positive energy

}

else{

e->quant[i] = e->old[i] - NewTemp;

//negative energy

e->quant[3] -= e->quant[i]; //total energy minus the negative energy

}

e->old[i] = NewTemp;// save the value for next time

new ++; //next data

}

AN2512 Datasheet(PDF) 31 Page - STMicroelectronics

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